Andrew, after some checking I still have a lot off your questions unanswered. From what I can find it looks like IH changed the head, pistons and precups at MD engine serial # 14501. The head and precups were the same as a SMD with the bore size of piston the only difference. 4 inch overbore piston for a MD was the same standard piston as a SMD. Can't find a compression ratio listed separate for a MD engine below 14501 or above. But a UD6 power unit has a serial break on pistons and head like a MD (same parts) and shows a 16.8 compression ratio after the serial break, 14.2 before. I don't have a 8228 head to look at, but the only differance there could be with heads used on a SMD that could change the compression ratio, is the size or depth of valve pockets or precup holes or length. With the same valves used I doubt the pockets are deeper. If your head isn't cracked after all this time it must be a good one. Would probably keep it.
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